|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||0601 To 1200|
|Locale Reference||airport : gmu|
|Altitude||agl bound lower : 0|
agl bound upper : 0
|Controlling Facilities||tower : cvg|
|Operator||general aviation : personal|
|Make Model Name||Small Aircraft, High Wing, 1 Eng, Fixed Gear|
|Flight Phase||ground other : taxi|
|Function||instruction : instructor|
|Qualification||pilot : cfi|
pilot : commercial
pilot : instrument
|Experience||flight time last 90 days : 98|
flight time total : 1563
flight time type : 50
|Function||instruction : trainee|
|Qualification||pilot : student|
|Independent Detector||other flight crewa|
|Resolutory Action||none taken : unable|
|Primary Problem||Flight Crew Human Performance|
|Air Traffic Incident||Pilot Deviation|
I was giving dual instruction. After completing the runup at the end of runway 36 at gmu, I decided to demonstrate to the student the importance of maintaining aft pressure on the yoke to prevent the tail from rising. I added power and applied forward pressure on the yoke. When the tail started to rise I applied aft pressure on the yoke. The tail continued to rise until the propeller contacted with the ground. The WX at gmu was 7000 scattered 3 mi in haze and the wind was 040 degrees at 10 KTS. I believe a gust of wind got the tail rising fast enough that reversed control input was not enough to stop it. Problem was misjudgment on my part to attempt the demonstration. In doing it I contradicted what I was teaching. In the future I will only explain (not demonstrate) this principle and use this experience as an example.
Original NASA ASRS Text
Title: TAIL ROSE AND PROPELLER STRUCK THE GND DURING CONTROL DEMONSTRATION.
Narrative: I WAS GIVING DUAL INSTRUCTION. AFTER COMPLETING THE RUNUP AT THE END OF RWY 36 AT GMU, I DECIDED TO DEMONSTRATE TO THE STUDENT THE IMPORTANCE OF MAINTAINING AFT PRESSURE ON THE YOKE TO PREVENT THE TAIL FROM RISING. I ADDED PWR AND APPLIED FORWARD PRESSURE ON THE YOKE. WHEN THE TAIL STARTED TO RISE I APPLIED AFT PRESSURE ON THE YOKE. THE TAIL CONTINUED TO RISE UNTIL THE PROP CONTACTED WITH THE GND. THE WX AT GMU WAS 7000 SCATTERED 3 MI IN HAZE AND THE WIND WAS 040 DEGS AT 10 KTS. I BELIEVE A GUST OF WIND GOT THE TAIL RISING FAST ENOUGH THAT REVERSED CTL INPUT WAS NOT ENOUGH TO STOP IT. PROB WAS MISJUDGMENT ON MY PART TO ATTEMPT THE DEMONSTRATION. IN DOING IT I CONTRADICTED WHAT I WAS TEACHING. IN THE FUTURE I WILL ONLY EXPLAIN (NOT DEMONSTRATE) THIS PRINCIPLE AND USE THIS EXPERIENCE AS AN EXAMPLE.
Data retrieved from NASA's ASRS site as of August 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.